https://blog.xidao.online/en/tags/tool-use/Recent content in Tool Use on XiDao Tech BlogHugo -- gohugo.ioen© 2026 XiDaoMon, 11 May 2026 09:00:00 +0800https://blog.xidao.online/en/posts/2026-llm-structured-output-function-calling/Mon, 11 May 2026 09:00:00 +0800https://blog.xidao.online/en/posts/2026-llm-structured-output-function-calling/<h2 class="relative group">Introduction: Why Structured Output Matters <div id="introduction-why-structured-output-matters" class="anchor"></div> <span class="absolute top-0 w-6 transition-opacity opacity-0 -start-6 not-prose group-hover:opacity-100 select-none"> <a class="text-primary-300 dark:text-neutral-700 !no-underline" href="#introduction-why-structured-output-matters" aria-label="Anchor">#</a> </span> </h2> <p>In 2026, large language model (LLM) applications have evolved from simple chatbots to complex autonomous agent systems. Throughout this evolution, one fundamental technical challenge has persisted: <strong>how to make LLM outputs reliably parseable by programs.</strong></p> <p>Traditional LLM output is free-form text, forcing developers to use fragile approaches like regex and string matching to extract information. Structured Output and Function Calling (Tool Use) technologies have completely changed this paradigm.</p>